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首页> 美国卫生研究院文献>Nanomaterials >Polyvinyl Alcohol-Few Layer Graphene Composite Films Prepared from Aqueous Colloids. Investigations of Mechanical Conductive and Gas Barrier Properties
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Polyvinyl Alcohol-Few Layer Graphene Composite Films Prepared from Aqueous Colloids. Investigations of Mechanical Conductive and Gas Barrier Properties

机译：聚乙烯醇 - 几层石墨烯复合膜由含水胶体制备。机械导电和阻气性能的研究

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摘要

Quasi all water soluble composites use graphene oxide (GO) or reduced graphene oxide (rGO) as graphene based additives despite the long and harsh conditions required for their preparation. Herein, polyvinyl alcohol (PVA) films containing few layer graphene (FLG) are prepared by the co-mixing of aqueous colloids and casting, where the FLG colloid is first obtained via an efficient, rapid, simple, and bio-compatible exfoliation method providing access to relatively large FLG flakes. The enhanced mechanical, electrical conductivity, and O2 barrier properties of the films are investigated and discussed together with the structure of the films. In four different series of the composites, the best Young’s modulus is measured for the films containing around 1% of FLG. The most significant enhancement is obtained for the series with the largest FLG sheets contrary to the elongation at break which is well improved for the series with the lowest FLG sheets. Relatively high one-side electrical conductivity and low percolation threshold are achieved when compared to GO/rGO composites (almost 10−3 S/cm for 3% of FLG and transport at 0.5% FLG), while the conductivity is affected by the formation of a macroscopic branched FLG network. The composites demonstrate a reduction of O2 transmission rate up to 60%.
机译：Quasi所有水溶性复合材料使用石墨烯（GO）或将石墨烯（RGO）作为基于石墨烯的添加剂，尽管它们的制备需要长而苛刻的条件。这里，由共混合水性胶体和铸造，其中第一通路的高效，快速，简单得到的FLG胶体，和生物相容的剥离方法提供制备含有少数层石墨烯（FLG）聚乙烯醇（PVA）薄膜进入相对较大的FLG薄片。研究了膜的增强的机械，电导率和O2阻隔性能，并与薄膜的结构一起讨论。在四个不同的复合材料系列中，为含有约1％的FLG的薄膜测量最佳杨氏模量。对于与最大折射的伸长率相反，对于与最低FLG片的系列良好的伸长率相反，获得最大的增强。与Go / Rgo复合材料（几乎10-3 s / cm为3％flg，0.5％flg运输）相比，实现相对较高的一侧导电性和低渗透阈值，而导电性受到形成的影响宏观分支的FLG网络。复合材料表明O2传输速率的降低高达60％。

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